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LONG-TERM DEBT - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Aug. 22, 2025
Mar. 10, 2022
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Line of Credit | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Maximum borrowing capacity on line of credit   $ 250.0      
Proceeds from borrowing under line of credit       $ 230.0  
Repayments of lines of credit       $ 110.0  
Line of Credit | Credit Agreement, JP Morgan Chase Administrator | Letter of Credit          
Debt Instrument          
Maximum borrowing capacity on line of credit     $ 20.0    
Line of Credit | Amended Credit Agreement, JP Morgan Chase Administrator          
Debt Instrument          
Maximum borrowing capacity on line of credit $ 500.0        
Number of days after maturity 91 days        
Line of Credit | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Interest rate     5.82%   6.14%
Proceeds from borrowing under line of credit     $ 265.0    
Repayments of lines of credit     165.0    
Remaining borrowing capacity on line of credit     147.6   $ 247.6
Letters of credit outstanding, amount     $ 2.4   $ 2.4
Debt covenant, leverage ratio 6.00        
Line of Credit | Minimum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Unused capacity on line of credit commitment fee percentage   0.25%      
Line of Credit | Minimum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Unused capacity on line of credit commitment fee percentage 0.25%        
Line of Credit | Maximum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Unused capacity on line of credit commitment fee percentage   0.375%      
Line of Credit | Maximum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Unused capacity on line of credit commitment fee percentage 0.35%        
Line of Credit | Base Rate | Minimum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate   2.00%      
Line of Credit | Base Rate | Minimum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate 1.00%        
Line of Credit | Base Rate | Maximum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate   2.75%      
Line of Credit | Base Rate | Maximum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate 1.75%        
Line of Credit | SOFR Rate | Minimum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate   3.00%      
Line of Credit | SOFR Rate | Minimum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate 2.00%        
Line of Credit | SOFR Rate | Maximum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate   3.75%      
Line of Credit | SOFR Rate | Maximum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate 2.75%        
Line of Credit | Eurodollar | Minimum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate   3.00%      
Line of Credit | Eurodollar | Minimum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate 2.00%        
Line of Credit | Eurodollar | Maximum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate   3.75%      
Line of Credit | Eurodollar | Maximum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate 2.75%        
Line of Credit | BritishPound Rate | Minimum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate   3.00%      
Line of Credit | BritishPound Rate | Minimum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate 2.00%        
Line of Credit | BritishPound Rate | Maximum | Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate   3.75%      
Line of Credit | BritishPound Rate | Maximum | Amended Credit Agreement, JP Morgan Chase Administrator | Revolving Credit Facility          
Debt Instrument          
Basis spread on variable interest rate 2.75%        
Senior Notes | 7.00% Senior Notes Maturing in March 2030          
Debt Instrument          
Interest rate 7.00%